Prestressed anchor rod composite soil nailing wall supporting structure

Abstract

The utility model provides a pre-stressed anchor rod composite soil nail wall supporting structure which comprises a net hanging concrete layer, a retention wall, soil nails and pre-stressed anchor rods, the retention wall is arranged on the top of a side slope, the bottom of the retention wall is connected with a net hanging guniting layer, a net hanging concrete layer is arranged on the surface of the side slope, and the soil nails and the pre-stressed anchor rods are evenly distributed on the net hanging guniting layer. The slope of the slope protection is 1: 0.5, the inclination angle of the soil nail is 15 degrees, concrete with the thickness of 80 mm is sprayed on the surface of the net hanging concrete layer, the inclination angle of the pre-stressed anchor rod is 15 degrees, channel steel is arranged on the two sides of the pre-stressed anchor rod, the middle of the channel steel on the two sides is connected with a steel plate, and the pre-stressed anchor rod is locked on a steel base plate on the top of the channel steel through a high-strength screw cap and fixed in a slope soil body through a centering support. The pre-stressed anchor rod composite soil nailing wall supporting structure is high in stability, high in bearing capacity and low in overall cost.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of building engineering, especially relates to a prestressed anchor rod composite soil nailing wall supporting structure. BACKGROUND

[0002] The prestressed anchor rod composite soil nailing wall supporting is a kind of foundation pit supporting method combined prestressed anchor rod and soil nailing wall, the stability and supporting effect of supporting structure are enhanced by setting prestressed anchor rod in soil nailing wall.This supporting method is applicable to the engineering with complex geological conditions, larger foundation pit depth and higher supporting requirement.

[0003] At present, groundwater level is higher, construction environment is complex, there is certain influence to construction, commonly used underground continuous wall collection inner support supporting system and pile anchor combined supporting structure cost is expensive, and the earthwork excavation amount of large slope after plain spray supporting scheme is larger, more site is occupied, and backfill quality is difficult to control. UTILITY MODEL CONTENT

[0004] Therefore, the utility model aims at providing a prestressed anchor rod composite soil nailing wall supporting structure to solve the problems of higher groundwater level, complex construction environment, certain influence to construction, commonly used underground continuous wall collection inner support supporting system and pile anchor combined supporting structure cost is expensive, and the earthwork excavation amount of large slope after plain spray supporting scheme is larger, more site is occupied, and backfill quality is difficult to control.

[0005] To achieve the above object, the technical scheme of the utility model is as follows:

[0006] The utility model provides a prestressed anchor rod composite soil nailing wall supporting structure, include, hang net concrete layer, retaining wall, soil nailing, prestressed anchor rod, slope top is retaining wall, the retaining wall bottom is connected hang net and sprays layer, slope surface is equipped with hang net concrete layer, several soil nailing and several prestressed anchor rods that are uniformly distributed on hang net and sprays layer, the slope gradient is 1:0.5, the soil nailing inclination is 15 DEG, the hang net concrete layer surface sprays the concrete of 80mm thickness, the prestressed anchor rod inclination is equipped with 15 DEG, the prestressed anchor rod both sides channel steel, the middle part of both sides channel steel is connected with steel sheet, and the prestressed anchor rod is locked in the top steel backing plate of channel steel through high-strength wire cap, and the prestressed anchor rod is fixed in the slope soil body through centering support.

[0007] Further, the diameter of the prestressed anchor rod is 25mm, the distance between any two adjacent prestressed anchor rods is 1.5m, and the diameter of the anchor rod hole is 120mm.

[0008] Further, the length of the prestressed anchor rod is 16m, 15m from top to bottom.

[0009] Further, the channel steel is a 14a type channel steel, the steel plate is 120*60*12 in specification, and the steel backing plate is 120*120*14 in specification.

[0010] Further, the layer of the hanging net concrete adopts a steel mesh with a diameter of 6.5, and the interval is 250*250mm, the hanging net is internally provided with a steel mesh reinforcing rib with a diameter of 14mm, and the steel mesh reinforcing rib is provided in double layers.

[0011] Further, the interval of any two adjacent soil nails is 1.5m, and the diameter of the soil nail is 20mm.

[0012] Further, the length of the soil nail is 8m, 9m, 8m and 6m from top to bottom.

[0013] Further, the water retaining wall is 1000mm away from the slope.

[0014] Compared with the prior art, the prestressed anchor rod composite soil nailing wall supporting structure has the following advantages:

[0015] In the prestressed anchor rod, the prestressed anchor rod is locked on the steel backing plate at the top of the channel steel through the high-strength wire cap, a firm connection can be formed, and the stability and the bearing capacity of the whole supporting structure are enhanced. The hanging net can enhance the stability of the supporting structure, the shotcrete can fill the gaps of the supporting structure, and the overall bearing capacity of the supporting structure is improved. The centering support ensures that the prestressed anchor rod is centered in the drilling hole, avoids deviation or close to the hole edge wall of the prestressed anchor rod under the action of the self weight or external force, so that the thickness of the mortar protective layer after grouting is uniform, the prestressed anchor rod is connected with the centering support, the supporting force is transmitted to the slope soil body, the stability and the bearing capacity of the supporting structure are enhanced, and the composite soil nailing wall supporting structure with the anchor rod is lower in cost than the pile-anchor combined support and the underground continuous wall support. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present application, and the schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application.

[0017] In the drawings:

[0018] Figure 1 The prestressed anchor rod composite soil nailing wall supporting structure described in the embodiments of the present application is a schematic diagram;

[0019] Figure 2 The prestressed anchor rod composite soil nailing wall supporting structure described in the embodiments of the present application is a schematic diagram;

[0020] Figure 3The prestressed anchor rod head connection schematic diagram in the prestressed anchor rod composite soil nailing wall supporting structure is shown in the embodiment of the utility model.

[0021] Figure 4 The prestressed anchor rod and slope connection schematic diagram in the prestressed anchor rod composite soil nailing wall supporting structure is shown in the embodiment of the utility model.

[0022] Marked with the following reference numerals:

[0023] 1, netted concrete layer; 2, water retaining wall; 3, soil nailing; 4, prestressed anchor rod; 5, steel backing plate; 6, channel steel; 7, steel plate; 8, high-strength wire cap; 9, reinforcing mesh reinforcing rib; 10, centering support. Specific implementation

[0024] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0025] In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relationship based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specified.

[0026] In the description of the utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood through specific circumstances.

[0027] The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0028] Reference Figures 1-4As shown, the embodiment provides a slope protection pile supporting structure based on micro steel pipe pile, which comprises a mesh concrete layer 1, a water retaining wall 2, soil nails 3, and prestressed anchor rods 4. The water retaining wall 2 is arranged at the top of the slope, and the bottom of the water retaining wall 2 is connected with the mesh shotcrete layer 1. The mesh concrete layer 1 is arranged on the surface of the slope, and the soil nails 3 and the prestressed anchor rods 4 are uniformly distributed on the mesh shotcrete layer 1. The slope gradient is 1:0.5, the inclination angle of the soil nails 3 is 15°, the surface of the mesh concrete layer 1 is sprayed with 80mm-thick concrete, the inclination angle of the prestressed anchor rods 1 is 15°, the two side channel steels 6 of the prestressed anchor rods 1 are connected with the steel plate 7 in the middle, the prestressed anchor rods 4 are locked on the top steel base plate 5 of the channel steel 6 through the high-strength wire cap 8, and the prestressed anchor rods 4 are fixed in the slope soil body through the centering support.

[0029] Specifically, in the embodiment, the diameter of the prestressed anchor rod 1 is 25mm, the distance between any two adjacent prestressed anchor rods 1 is 1.5m, and the diameter of the anchor rod hole is 120mm.

[0030] Specifically, in the embodiment, the length of the prestressed anchor rod 1 is 16m, 15m, and 15m from top to bottom.

[0031] Specifically, in the embodiment, the channel steel 6 is a 14a type channel steel, the specification of the steel plate 7 is 120×60×12, the specification of the steel base plate 5 is 120×120×14, and the steel base plate 5 is wedge-shaped.

[0032] Specifically, in the embodiment, the mesh concrete layer 1 adopts a φ6.5 steel mesh with a spacing of 250×250mm, and a steel mesh reinforcing rib 9 with a diameter of 14mm is arranged in the mesh 3, and the steel mesh reinforcing rib 9 is double-layered.

[0033] Specifically, in the embodiment, the distance between any two adjacent soil nails 3 is 1.5m, and the diameter of the soil nail 3 is 20mm.

[0034] Specifically, in the embodiment, the length of the soil nail 3 is 8m, 9m, 8m, and 6m from top to bottom.

[0035] Specifically, in the embodiment, the distance between the water retaining wall 2 and the slope is 1000mm.

[0036] In the embodiment, the foundation pit base is 10.35 m, the diameter of the soil nail is 20 mm, the installation angle is 15°, the diameter of the prestressed anchor rod is 25 mm, and the installation angle is 15°. The supporting structure is sequentially composed of the soil nail with a length of 8 m, the prestressed anchor rod with a length of 16 m, the soil nail with a length of 9 m, the prestressed anchor rod with a length of 15 m, the soil nail with a length of 8 m, and the soil nail with a length of 6 m. The distribution steel of the net-sprayed layer is made of a steel bar with a diameter of 6.5 mm, and the bidirectional interval is 250 mm. The grouting cement slurry is used for the soil nail grouting, and the secondary grouting technology is used, the secondary grouting pressure is not less than 1.5 MPa, the cement is P.C32.5, and the grouting water-cement ratio is 0.5. When the net-concrete layer is sprayed, the cement grade is P.C32.5, the medium sand, and the maximum particle size of the stone should not be greater than 10 mm, and the weight ratio of the cement, the sand and the stone is 1:2:2. Before the anchor rod is formed, the hole position is determined according to the design requirements and the soil layer conditions, and the mark is made, the hole depth deviation is ±50 mm, the hole distance deviation is ±100 mm, the hole diameter deviation is ±5 mm, the deflection size of the bottom of the hole is not greater than 3% of the diameter of the anchoring body, the grouting cement slurry is used for the anchor rod grouting, the cement is P.C32.5, and the grouting water-cement ratio is 0.5. During the construction, the hole depth deviation of the soil nail is ±50 mm, the hole distance deviation is ±100 mm, and the hole diameter deviation is ±5 mm.

[0037] The prestressed anchor rod is locked on the steel backing plate at the top of the channel steel through the high-strength wire cap, a firm connection can be formed, and the stability and the bearing capacity of the whole supporting structure are enhanced. The net can enhance the stability of the supporting structure, the grouting can fill the gaps of the supporting structure, and the overall bearing capacity of the supporting structure is improved. The centering support ensures that the prestressed anchor rod is centered in the hole, avoids deviation or close to the hole edge wall of the prestressed anchor rod under the action of the self weight or external force, thereby ensuring that the mortar protection layer after grouting is uniform in thickness, the prestressed anchor rod transmits the supporting force to the slope soil body through the connection with the centering support, the stability and the bearing capacity of the supporting structure are enhanced, and the composite soil nail wall supporting structure with the added anchor rod has lower cost than the pile-anchor combined supporting and the underground continuous wall supporting.

[0038] The above is only a preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A prestressed anchor rod composite soil nailing wall support structure, characterized by, It includes, the hanging net concrete layer (1), the water retaining wall (2), the soil nail (3), the prestressed anchor rod (4), the slope top sets the water retaining wall (2), the water retaining wall (2) bottom connects the hanging net concrete layer (1), the slope surface sets the hanging net concrete layer (1), several soil nails (3) and several prestressed anchor rods (4) on the hanging net concrete layer (1) are uniformly distributed, the slope gradient is 1:0.5, the soil nail (3) inclination is 15 °, the hanging net concrete layer (1) surface sprays the concrete with the thickness of 80㎜, the prestressed anchor rod (4) inclination is set to 15 °, the prestressed anchor rod (4) both sides channel steel (6), the middle part of both sides channel steel is connected with the steel plate (7), the prestressed anchor rod (4) is locked in the channel steel (6) top steel backing plate (5) through the high-strength wire cap (8), and the prestressed anchor rod (4) is fixed in the slope soil body through the centering support.

2. The prestressed anchor rod composite soil nailing wall supporting structure according to claim 1, characterized in that, The prestressed anchor rod (4) diameter is 25㎜, the distance between any two adjacent prestressed anchor rods (4) is 1.5m, and the diameter of the anchor rod hole is 120㎜.

3. The prestressed anchor rod composite soil nailing wall supporting structure according to claim 2, characterized in that, The prestressed anchor rod (4) length is 16m, 15m from top to bottom.

4. The prestressed anchor rod composite soil nailing wall supporting structure according to claim 1, characterized in that, The channel steel (6) is 14a type channel steel, the steel plate (7) specification is 120×60×12, the steel backing plate (5) specification is 120×120×14, and the steel backing plate (5) is wedge-shaped.

5. The prestressed anchor rod composite soil nailing wall supporting structure according to claim 1, characterized in that, The hanging net concrete layer (1) adopts φ6.5 steel mesh, and the spacing is 250×250mm, the hanging net concrete layer (1) is provided with a steel mesh reinforcing bar (9) with a diameter of 14㎜, and the steel mesh reinforcing bar (9) is double-layered.

6. The prestressed anchor rod composite soil nailing wall supporting structure according to claim 1, characterized by, The distance between any two adjacent soil nails (3) is 1.5m, and the diameter of the soil nail (3) is 20㎜.

7. The prestressed anchor rod composite soil nailing wall supporting structure according to claim 5, characterized in that, The length of the soil nail (3) is 8m, 9m, 8m and 6m from top to bottom.

8. The prestressed anchor rod composite soil nailing wall supporting structure according to claim 1, characterized by, The water retaining wall (2) is 1000㎜ away from the slope.

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